class_docstr: For
  `Visual Basic.NET <http://msdn2.microsoft.com/en-us/vbasic/default.aspx>`_
  source code.
code: def analyse_text(text):
      if re.search(r"^\s*(#If|Module|Namespace)", text, re.MULTILINE):
          return 0.5
  
imports: import re
  from pygments.lexer import RegexLexer, DelegatingLexer, bygroups, include, using, this, default, words
  from pygments.token import Punctuation, Text, Comment, Operator, Keyword, Name, String, Number, Literal, Other
  from pygments.util import get_choice_opt, iteritems
  from pygments import unistring
  from pygments.lexers.html import XmlLexer
label_desc: Use image node_id 1 for calling the VbNetLexer obj's underlying member method code with example usage: obj.analyse_text(text) and returns: int